Method for grafting maleic anhydride with ethylene propylene terpolymer

A technology of EPDM rubber grafted with maleic anhydride, which is applied in the field of modification of EPDM rubber, can solve problems such as blending of difficult polar polymers, and reduce production costs, save energy, and graft high rate effect

Active Publication Date: 2010-09-01
张万鹏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since EPDM is a non-polar rubber, it is difficult to blend with polar polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1. A method for grafting maleic anhydride to EPDM rubber, which uses EPDM rubber as a raw material, uses maleic anhydride as a grafting monomer, adds a plasticizer, a reinforcing agent and a vulcanization retarder, and mixes uniformly Finally, put the mixture into the extruder to melt the blending agent to granulate, and obtain the grafted EPDM-g-MAH of EPDM rubber and maleic anhydride; before the mixture is melted, it is irradiated with high-energy rays by a radiation source ; When granulating, the length-to-diameter ratio of the screw of the extruder is 15:1, the rotational speed of the extruder is 30 rpm, and the die temperature of the extruder is 60°C.

Embodiment 2

[0014] Example 2. A method for grafting maleic anhydride to EPDM rubber, which uses EPDM rubber as a raw material, uses maleic anhydride as a grafting monomer, adds a plasticizer, a reinforcing agent and a vulcanization retarder, and mixes uniformly Finally, put the mixture into the extruder to melt the blending agent to granulate, and obtain the grafted EPDM-g-MAH of EPDM rubber and maleic anhydride; before the mixture is melted, it is irradiated with high-energy rays by a radiation source ; When granulating, the screw length-to-diameter ratio of the extruder is 33:1, the speed of the extruder is 180 rpm, and the die temperature of the extruder is 180°C.

Embodiment 3

[0015] Example 3. A method for grafting maleic anhydride to EPDM rubber, which uses EPDM rubber as a raw material, uses maleic anhydride as a grafting monomer, adds a plasticizer, a reinforcing agent and a vulcanization retarder, and mixes uniformly Finally, put the mixture into the extruder to melt the blending agent to granulate, and obtain the grafted EPDM-g-MAH of EPDM rubber and maleic anhydride; before the mixture is melted, it is irradiated with high-energy rays by a radiation source ; When granulating, the length-to-diameter ratio of the screw of the extruder is 20:1, the speed of the extruder is 70 rpm, and the die temperature of the extruder is 100°C.

[0016] In this embodiment, the plasticizer is a fatty acid ester plasticizer; the reinforcing agent is talcum powder; the vulcanization retarder is salicylic acid; the radiation source is cobalt Co 60 Or γ-rays produced by electron accelerators; EPDM rubber accounts for 50% of the total weight of raw materials, and m...

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PUM

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Abstract

The invention relates to a method for grafting maleic anhydride by ethylene propylene diene monomers. The method is characterized in that the ethylene propylene diene monomers are taken as raw materials, maleic anhydride is taken as a grafting monomer, a plasticizer, a reinforcing agent and a vulcanization retarder are added, the obtained mixture is evenly mixed and then put into an extruder to be fused and blended so as to granulate and obtain the graft of ethylene propylene diene monomers and maleic anhydride, i.e., EPDM-g-MAH; before the fusion and extrusion of the mixture, high-energy rayradiation is carried out to the mixture by a radiant point; and during granulation, the length-diameter ratio of the screw of the extruder is 15 to 33:1, the rotation speed of the extruder is 30 r / min to 180 r / min and the temperature of the die orifice of the extruder is 60 DEG C to 180 DEG C. The method does not cause the ethylene propylene diene monomers (EPDM) to gel, which is conducive to thecompatibility of the ethylene propylene diene monomer with a polar polymer (engineering plastics); the grafting rate of the grafting product is high and can reach up to 1.2 percent to 3.6 percent; and radiation grafting adopted does not pollute the environment, saves energy and reduces production cost by about 30 percent.

Description

technical field [0001] The invention relates to a method for modifying EPDM rubber, in particular to a method for grafting maleic anhydride to EPDM rubber. Background technique [0002] Ethylenepropylene diene monomer (EPDM) has excellent physical and chemical properties, and its application in engineering plastics toughening and ozone aging resistance is very prominent. However, since EPDM is a non-polar rubber, it is difficult to blend with polar polymers. Therefore, it is particularly important to modify EPDM to enhance its compatibility with polar polymers. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a new method for grafting maleic anhydride to EPDM rubber that effectively enhances the compatibility of EPDM rubber and polar polymers for the deficiencies in the prior art. [0004] The technical problem to be solved by the present invention is achieved through the following technical solutions. The pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/46C08L51/06C08K3/34C08K3/36C08K5/372B29B9/12C08K3/26C08K5/13C08F255/06C08K5/01B29C47/92C08K5/10B29C48/92
CPCB29C48/625B29C48/04B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92904
Inventor 张万鹏金绍培
Owner 张万鹏
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